Probably all species referred to as Hallopora from the type Cincinnatian are actually Parvohallopora.
Hallopora elegantula Author unknown
Reference: Schumacher et al. in Davis and Cuffey, 1998 (mention)
The occurrence of this species in the type Cincinnatian is questionable, as H. elegantula is a Silurian species. This report is likely a misidentification.
Reference: Dalvé, 1948